Remember this thing......
Sikorsky S-75........ 76 dynamics, proof of concept all-composite helicopter.
Add in a bit of R&D, a-la Bird of Prey, LM X-55 etc.
There is no reason to believe that Uncle Sam has not developed a low-observable carbon composite fuse using existing dynamics.
Have a look at the other thread in Rotorheads, the head is clearly Black/Sea/Naughtyhawk .......
Throw in a bit of Comanche.....
At least when the customers start complaining about the "black helicopters" we know they are lying..... its clear they are a silver-grey